英语语法题1.The last decade___tremendous changes in the means of

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英语语法题
1.The last decade___tremendous changes in the means of transportation.
A.has witnessed B.was witnessed C.witnessed D.is witnessed
答案为什么是C?A为什么不可以?
2.When they entered the room,they found the windows open and something___
A.stolen B.to be stolen C.to steal D.stealing
3.The research scientists often meet with problems___new types of instruments for their solution.
A.require B.to require C.required D.requiring
我的英语基础差,希望大家能给讲一下为什么,不要只是给答案,

1 ‘The last decade’ 是明显的过去时语态,不能选A 必须选C
2 A 先翻译一下句子,进入房间的时候他们发现窗子打开,东西被偷了.something后面接形容词,东西是被偷,所以选被动语态,排除CD
东西被偷已经发生了,不能用 to be 形式,这个表示将来时
所以用动词的过去分词,表被动.
3 C 科学家经常遇到一些需要用新的方法解决的问题.
问题需要被解决.动词的过去分词当做形容词.所以选C
如果你英语基础差,然后再选就行了.

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